Seoul Removes Final Variable Lane After 44 Years

Seoul is set to dismantle its final "variable lane" on Sogong-ro, a short 250-meter section of road between the Chosun Hotel intersection and the Bank of Korea intersection. This marks the end of an era, as this particular lane, first implemented in August 1981, was the last of its kind in the city, operating for 44 years and 10 months.

Variable lanes, a traffic management technique popular in the 1970s and 80s, were designed to optimize the use of narrow urban roads. They functioned by altering the direction of the central lane based on traffic volume. During peak hours when traffic flowed heavily in one direction, a green arrow would signal the lane was open, while a red 'X' would block traffic from the opposite direction. Sogong-ro, a key route connecting Seoul Plaza to the Namsan 3 Tunnel, was a vital artery for vehicles heading towards Yongsan, Banpo, and the express bus terminal.

However, the efficiency goal of variable lanes eventually gave way to safety concerns. The complex signal system posed a risk of head-on collisions if drivers misinterpreted the signals. Recognizing these dangers, Seoul began phasing out variable lanes in 2001, starting with roads like Dobong-ro and Wangsan-ro, and continued the process, eliminating them from Toegyero and Wangsimni-ro by 2018. The Sogong-ro lane was the last remaining example.

The removal of this variable lane signifies more than just the elimination of a traffic signal. The road's five lanes will be reduced to four, increasing lane width from a minimum of 2.8 meters to the legal standard of over 3 meters. The reclaimed space will be dedicated to pedestrians, significantly widening the sidewalk along the Chosun Hotel to Seoul Plaza route from its current narrow 0.7 meters to 2.7 meters. This transformation will create a more pedestrian-friendly environment on a street historically dominated by vehicular traffic.